NOGUCHI PLATE 30 




4 Rake: oy ‘ 
2 & } 
5 | 
> C en, 
ua opcesia atau 
ra x - 
Loe Lay, 
os 
‘ 1 aie 
; [fe Sy E 
. 
; (ez 
“Ny E 
‘ ° 
4 wk 
ne 
6 
4 
| 
; 0 
! 
’ 
5S 


1 to 4. Eggs of Arbacia punctulata. 1, Normal. 2 to 4, Different stages of 
Ovolysis caused by | per cent Cobra venom in sea-water. 
5 to 8. Eggs of Lepidonatus squamatus. 5, Normal. 6 and 7, Different stages 
of Ovolyais caused by | per cent Cobra and 2 per cent Crotalus venom, 
showing no real Ovolysis, but peculiar Retraction of Deutoplasm. 
» 9to 11. Pluteus stage of Arbacia punctulata. 9, Normal, active pluteus. 10, Plu- 
teus under the effect of 2 per cent Cobra venom, 11, Disintegration 
under the effect of same venom. 
(Drawings by Noguchi.) 
